Re: [Xen-tools] [PATCH] An example console driver using the store

[Anthony Liguori <aliguori@xxxxxxxxxx>]

Hi Rusty,

One thing we might want to consider doing is having the domain builder 
allocate a page/event channel for the first console.  This gives us 
access to the console in a guest at start of day (and would work even if 
the store is not running).  I think this later reason is particuarily 
important since it's hard to debug the XenBus code in a guest without a 
console.
Also, it allows the PPC guys to hack up the hypervisor to support the 
PAPR console stuff since they can get to the ring buffer by examining 
the shared_info_frame.  It's not a long term solution but it's useful.
Thoughts?

Regards,

Anthony Liguori

Rusty Russell wrote:

> Sorry this took so long, distracted by other things.
>
> This patch adds xenbus_early_write, for use before we can sleep, and
> illustrates how a console driver can use the store.  The console driver
> replaces the normal one for testing, and uses the same ringbuf code as
> xenbus (which really should be extracted into a separate library).
>
> The toy client only handles a single page for the buffer, doesn't handle
> ^C etc.
>
> This uncovered some bugs in xenstored: patches coming. 
> Cheers!
> Rusty.
>
> Signed-off-by: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
>  

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